From coherent shocklets to giant collective incoherent shock waves in nonlocal turbulent flows

Xu, G., Vocke, D., Faccio, D. , Garnier, J., Roger, T., Trillo, S. and Picozzi, A. (2015) From coherent shocklets to giant collective incoherent shock waves in nonlocal turbulent flows. Nature Communications, 6, 8131. (doi: 10.1038/ncomms9131) (PMID:26348292) (PMCID:PMC4569716)

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Understanding turbulent flows arising from random dispersive waves that interact strongly through nonlinearities is a challenging issue in physics. Here we report the observation of a characteristic transition: strengthening the nonlocal character of the nonlinear response drives the system from a fully turbulent regime, featuring a sea of coherent small-scale dispersive shock waves (shocklets) towards the unexpected emergence of a giant collective incoherent shock wave. The front of such global incoherent shock carries most of the stochastic fluctuations and is responsible for a peculiar folding of the local spectrum. Nonlinear optics experiments performed in a solution of graphene nano-flakes clearly highlight this remarkable transition. Our observations shed new light on the role of long-range interactions in strongly nonlinear wave systems operating far from thermodynamic equilibrium, which reveals analogies with, for example, gravitational systems, and establishes a new scenario that can be common to many turbulent flows in photonic quantum fluids, hydrodynamics and Bose–Einstein condensates.

Item Type:Articles
Additional Information:D.F., D.V. and T.R. acknowledge support from European Research Council under the European Unions Seventh Framework Programme (FP/2007–2013)/ERC GA 306559 and EPSRC (UK, grant EP/J00443X/1). S.T. acknowledges funding from Italian Ministry of Research (grant PRIN 2012BFNWZ2). A.P. and G.X. acknowledge support from the French National Research Agency (ANR-12-BS04-0011 OPTIROC) and the Labex ACTION (ANR-11-LABX-01-01) programme.
Glasgow Author(s) Enlighten ID:Faccio, Professor Daniele
Authors: Xu, G., Vocke, D., Faccio, D., Garnier, J., Roger, T., Trillo, S., and Picozzi, A.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Nature Communications
Publisher:Nature Publishing Group
ISSN (Online):2041-1723
Copyright Holders:Copyright © 2015 Macmillan Publishers Limited
First Published:First published in Nature Communications 6:8131
Publisher Policy:Reproduced under a Creative Commons License

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